* Fixes to warnings given by gcc 10.

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diff --git a/doc/tech-notes/tech-notes.txt b/doc/tech-notes/tech-notes.txt
index 9f4ff4d1..f9702f52 100644
--- a/doc/tech-notes/tech-notes.txt
+++ b/doc/tech-notes/tech-notes.txt
@@ -1,106 +1,4 @@
 
-                             Alpine Technical Notes
-
-   Version 2.24, October 2020
-
-Table of Contents
-
-  Introduction
-
-     * Design Goals
-     * Alpine Components
-
-  Background Details
-
-     * Domain Names
-     * RFC 2822 Compliance
-     * SMTP and Sendmail
-     * Internet Message Access Protocol (IMAP)
-     * Multipurpose Internet Mail Extensions (MIME)
-     * Folder Collections
-
-  Building and Installation
-
-     * Compile-time Options
-     * Including LDAP Functionality
-     * Including Kerberos 5 Functionality
-     * Other Alpine Compile-time Options
-     * IMAPd Compile-time Options
-     * Building the Alpine Programs
-     * Installing Alpine and Pico on UNIX Platforms
-     * Installing PC-Alpine
-     * Installing IMAPd
-     * Support Files and Environment Variables: UNIX Alpine
-     * Support Files, Environment Variables, and Registry Values:
-       PC-Alpine
-
-  Command Line Arguments
-
-     * Alpine
-     * Pico
-     * Pilot
-
-  Configuration and Preferences
-
-     * Alpine Configuration
-     * General Configuration Variables
-     * Configuration Features
-     * Hidden Config Variables and Features
-     * Retired Variables
-     * Tokens for Index and Replying
-     * Conditional Inclusion of Text for Reply-Leadin, Signatures, and
-       Templates
-     * Per Server Directory Configuration
-     * Color Configuration
-     * Index Line Color Configuration
-     * Role Configuration
-     * Filtering Configuration
-     * Scoring Configuration
-     * Other Rules Configuration
-     * Search Rules Configuration
-     * Patterns
-     * Configuring News
-       Configuration Notes
-          + Alpine in Function Key Mode
-          + Domain Settings
-          + Syntax for Collections
-          + Syntax for Folder Names
-          + Server Name Syntax
-          + Folder Namespaces
-          + What is a Mail Drop?
-          + Sorting a Folder
-          + Alternate Editor
-          + Signatures and Signature Placement
-          + Feature List Variable
-          + Configuration Inheritance
-          + Using Environment Variables
-          + SMTP Servers
-          + MIME.Types file
-          + Color Details
-          + S/MIME Overview
-          + Additional Notes on PC-Alpine
-
-  Behind the Scenes
-
-     * Address Books
-     * Remote Configuration
-     * Checkpointing
-     * Debug Files
-     * INBOX and Special Folders
-     * Internal Help Files
-     * International Character Sets
-     * Interrupted and Postponed Messages
-     * Message Status
-     * MIME: Reading a Message
-     * MIME: Sending a Message
-     * New Mail Notification
-     * NFS
-     * Printers and Printing
-     * Save and Export
-     * Sent Mail
-     * Spell Checker
-     * Terminal Emulation and Key Mapping
-
                                   Introduction
 
 Design Goals